Insulator for overhead conductors of electric lines.



F. LIBANO.

TNSULATOR vFOR OVERHEAD CONDUCTORS 0F ELECTRIC LINES.

APPLICATION FILED MAY 23. 1914.

1,156,089. Patented Oct. 12, 1915.

inventor.- ferdmandlzbano,

' ms/Izzy, v

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FERDINAND LIBANO, OF TRIESTE, AUSTRIA-HUNGARY.

INSULATOR FOR OVERHEAD CONDUCTORS ELECTRIC LINES.

Specification of Letters Patent.

Patented Oct. 12, 1 915.

Application filed May 23, 1914. Serial No. 840,539.

To all whom it may concern:

Be it known that I, FERDINAND LIBANo, a subject of the Emperor of Austria-Hungary, residing in 5 Piazza Della Caserma, Trieste, Austria-Hungary, have invented certain new and useful Improvements in Insulators for Overhead Conductors of Electric Lines, of which the following is a specification.

This invention relates to an improved insulator for overhead electric lines and 0011- sists in the particular construction and arrangement of parts as will be fully described hereinafter.

The main object of this invention is to provide an insulating device in which the insulating material which is generally porcelain will be subject to the fewest possible strains so as to enhance the long life of such insulating device and also maintain the same in proper working order without the necessity of frequent repairs or replacement. To this end an arrangement has been provided whereby the insulating material such as porcelain will receive but one strain and that a compression strain for which purpose two cone-shaped insulating members preferably composed of porcelain are provided on the conical surfaces of which the supporting means for the electric lines is mounted.

Another object of this invention is to provide a cushioning means for insulators of the class described which will compensate for irregularities in the surfaces of the insulating members and to prevent chattering of the porcelains to which end washers composed of soft metal such as lead are employed to contact with and to space apart the metal parts from the porcelains of the insulating devices.

Still another object of the invention is to provide an insulating device in which the lateral supporting strains are carried entirely by metal parts without affecting the porcelains in any way.

These and other features, capabilities and advantages of the invention will appear from the detail description of one specific embodiment thereof illustrated in the accompanying drawings in which:

Figure 1 is an elevation showing the porcelains and other parts in axial section; Fig. 2 is an elevation, looking at the diminished end of one of the porcelains, the otherporcelain and certain other parts of the device being broken away for the purpose of illustration. r

the bolt and the other secured to the other end of the bolt, insulating members 2' and 71 mounted on said bolt a between said brackets (Z, (Z on which insulating members is mounted a strap mprovided with feed wire securing a wire p as illustrated.

The strap m is an annular metallic body, having a screw projection n at its top by means of which a shoe for the feed lineis fixed .inplace and also having a screw PTO". jection n by means of which a line wire clamp r is secured to the metallic body, the line wire clamp 7' being shown as clamping a line wire If there are a number of lines to clamp, a plurality of clamping devices may be provided.

The inner surfaces of the opening through the strap m'is of a smaller dimension at its middle portion than at both its outer ends, it deflecting in a direction away from the axis of the opening toward both outer endsof the opening from the middle diminished portion. In each of the outmg means and a line wire clamp 1" for clamp- I l wardly extending portions of the stra-p m,

there is positioned one of the insulating bodies'z' and if, two being shown which'are composed of porcelain or some other suitable material and which are in the form of frusto-cones or similar conical bodies having bores shown. as located centrally about their central axes. These insulating bodies are positioned in the strap m with their smaller bases directed toward one another so that their conical surfaces which correspond in form to the'outwardly deflecting surfaces of the strap we will fit snugly against such deflecting surfaces.

To compensate for irregularities ofsurfaces in the porcelain or other composition of which the insulating bodies z' and iare composed, there is provided a washer is of lead or the like which is secured between the strap m and the insulating bodies 2' and i. This combination of the strap m with the insulating bodies z' and z" behave like a simple unitary structure if adequate pressure is employed since normal surface friction is sufficient to prevent undesired rotation of the respective parts. In order to avoid any rotation with certainty, however, it is ad vantageous to provide suitably formed projections on the insulating bodies engaging corresponding recesses in the strap m or vice versa. The said system is carried directly by a bolt a which is passed through the bores in the insulating bodies 5 and a" which are preferably provided with a pressure absorbing or reducing insertion g composed of lead, india-rubber tubing or the like.

The axial bolt is particularly adapted for, and in the present instance is shown as carrying the brackets (Z, d provided with arms 6, 6 having openings 0, 0 respectively by means of which suitable supporting means are connected for the purpose of fixing the line being supported and suspension wires. The bol also carries washers h and h to compensate for irregularities in the surface, which washers are secured on the bolt between the porcelain bodies i and z" and the adjacent shoulders of the brackets cl, cl, respectively. A screw nut is secured at one end of the bolt a which holds the entire system together. It is however, advantageous to arrange one or more resilient plates beneath this nut to assure a certain amount of elasticity for the insulator while at the same time holding the entire system firmly together, whereby a very e'liicient superficial loading of the insulating body is insured and harmful intermittent strains are avoided.

In order to prevent the rotation of the brackets 65, d out of their correct position when the straining wires do not exert a central pull, each of these brackets is provided on its bearing side or shoulder with suitably formed projections 7 which engage in corresponding recesses Z in its adjacent insulating body. It is obvious that in cases of need, if bolts of suitable length are provided, a number of the insulating pairs described can be arranged side by side.

What I claim is:

1. An insulator for overhead wires of electric lines having a strap provided with a central bore, a line wire clamp formed on said strap, the bore of said strap deflecting away from the axis and toward both outer ends thereof, a conical insulating member secured in each outer end of said strap with its smaller base directed toward the smaller base of the other insulating member, their conical surfaces corresponding to the deflecting surfaces of the strap, there being concentric central bores provided in said insulating members, a bolt secured in the bores of said insulating members, support- 1 ing brackets mounted on each end of said bolt and having shoulders abutting against the respective broad bases of said insulating members, and a nut on said bolt to secure said brackets against said insulating members.

2. In an insulator for overhead electric wires, the combination with a horizontally extending supporting member, shoulders on said supporting member facing one another, conical insulating members mounted on said supporting member, one secured against each of the shoulders, and a line clamp strap supported by said insulating members and tending to press the insulating members away from one another and against the shoulders when in supporting position.

3. In an insulator for overhead electric wires, the combination with a horizontally extending supporting member, shoulders on said supporting member facing one another, conical insulating members mounted on said supporting member, one secured against each of the shoulders, and a line clamp strap supported by said insulating members, and tending to press the insulating members away from one another and against the shoulders when in supporting position, and washers enveloping said insulating members to compensate for irregularities of the surfaces of said insulating members.

4. In an insulator for overhead electric wires, the combination with a horizontally extending supporting member, shoulders on said supporting member facing one another, conical porcelain members mounted on said supporting member, one secured against each of the shoulders, a strap supported by said porcelain members and tending to press the same away from one another and against the shoulders when in supporting position, a feed line securing shoe on said strap, a line clamp on said strap, and soft metal washers secured around said porcelain members to compensate for irregularities of its surfaces, and thus to prevent chattering of such porcelain members.

5. In an insulator for overhead electric wires, the combination with a horizontally extending supporting member, a pressure absorbing insertion on said supporting member, conical insulating members mounted on said insertion, a soft metal washer on the conical surfaces of said insulating members, and a line clamp strap supported by said insulating members, being separated therefrom by said soft metal washer, and

tending to press the insulating members away from one another when in supporting position.

6. An insulator for overhead wires of electric'lines having a strap provided with strap with its smaller base directed toward the smaller base of the other insulating member, their conical surfaces corresponding to the deflecting surfaces of the strap, a soft metal washer between the conical surfaces of said insulating members and said deflecting surfaces to compensate for irregularities in said conical surfaces, a bolt extending through the bores of said insulating members, supporting brackets mounted on each end of said bolt and having shoulders facing the respective broad bases of said insulating members, and soft metal washers between said shoulders and the broad bases of said insulating members to compensate for irregularities in the surfaces of said insulating members.

7. An insulator for overhead wires of electric lines having a strap provided with a central bore, feed wire carrying means formed on said strap, a line Wire clamp formed on said strap, the bore of said strap deflecting away from the axis and toward both outer ends thereof, a conical insulating member secured in each outer end of said strap with its smaller base directed toward the smaller base of the other insulating member, their conical surfaces corresponding to the deflecting surfaces of the strap, a soft metal washer between the conical surfaces of said insulating members and said deflecting surfaces to compensate for irregularities in said conical surfaces, a bolt extending through the bores of said insulating members, a pressure absorbing insertion located between said bolt and said insulating members, supporting brackets mounted on each end of said bolt and having shoulders facing the broad bases of said insulating members and soft metal washers between said shoulders and the broad bases of said insulating members to compensate for irregularities in the surfaces of said insulating members.

In witness whereof I have hereunto set my hand in presence of two witnesses.

ING. FERDINAND LIBANO. Witnesses:

F. DULER, R. HARTMANN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

